henry kissinger on behalf of the united states and special adviser on the democratic republic of vietnam. the agreement will be formally signed by the parties participating a paris conference on vietnam on january 27 1973 at the international conference center in paris. >> president nixon on this day in 1973 announcing the end of the u.s. involvement in vietnam war. under the paris peace accord u.s. forces with drew from south vietnam and prisoners were exchanged. welcome back to "cbs this morning." >>> we have a story of hope overcoming heartbreak. you'll meet a group of young widows who learned to rebuild their lives and bring fun back in their lives. that's coming up on "cbs this morning." >> announcer: this portion of "cbs this morning" sponsored by mercedes-benz. experience truly great engineering today at your authorized dealer. authorized dealer. as an innovator. to hold more than one patent of this caliber... would define you as a true leader. ♪ ♪ to hold over 80,000... well, that would make you... the creators of the 2013 mercedes-benz e-class... quite possibly the most adva